JP2011223603A - Signal processing apparatus and signal processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal processing apparatus for controlling recording through the application of decryption processing to broadcasting data encrypted on a transmission channel according to a data processing load.SOLUTION: The signal processing apparatus comprises: retrieval means to retrieve first broadcasting data encrypted by a first encryption process; measurement means to measure a processing load of recording the first broadcasting data; determining means to determine whether or not decryption processing should be performed for each region of the first broadcasting data retrieved by the retrieval means based on the processing load; first decryption means to generate second broadcasting data containing a decryption region decrypted through the decryption process if it has been determined that at least some region of the first broadcasting data should be decrypted through the decryption process; encryption means to encrypt the first or the second broadcasting data through a second encryption process and generate recording data; and storing means to record the recording data, information on the decryption process, and segmentation information between the decryption region and non-decryption region.

Description

  The present invention relates to a broadcast signal recording / reproducing technique in a signal processing live apparatus.

  As is well known, in recent years, digitization of television broadcasting has been promoted. For example, in Japan, not only satellite digital broadcasting such as BS (Broadcasting Satellite) digital broadcasting and 110-degree CS (Communication Satellite) digital broadcasting but also terrestrial digital broadcasting has been started. Furthermore, IP (Internet Protocol) broadcasts are distributed over a network.

  These digital broadcast data are encrypted on the transmission path. When receiving the broadcast data, the signal processing device decodes the broadcast data during the recording process. The signal processing device encrypts the decrypted broadcast data for recording and records it in the storage device. The signal processing device decrypts the broadcast data encrypted for recording during the reproduction process.

  Japanese Patent Application Laid-Open No. 2004-228867 switches between decoding all encoded screens or skipping some decoding processes of each encoded screen according to the processing load in the information processing apparatus during moving image reproduction processing. And a configuration for efficient decoding processing is disclosed.

JP 2006-101406 A

  However, Patent Document 1 does not disclose a configuration in which encrypted broadcast data on a transmission line is efficiently decrypted and recorded in a storage device in accordance with the processing load during video recording processing.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a signal processing apparatus that performs recording control by performing decryption processing adapted to a processing load on encrypted broadcast data on a transmission path.

  The signal processing apparatus according to the present invention includes an acquisition unit that acquires the first broadcast data encrypted by the first encryption process, and a measurement unit that measures a processing load during the recording process in the first broadcast data. And first determination means for determining whether or not to decode in the first decoding process for each area of the first broadcast data acquired by the acquisition means based on the processing load, When the determination means determines that at least a part of the first broadcast data is to be decoded by the first decoding process, the first broadcast data includes a decoding area decoded by the first decoding process. The first decoding means for generating the second broadcast data, and if the first decoding means does not generate the second broadcast data, the first decoding means When the second broadcast data is generated, the second broadcast Encryption means for encrypting the data in a second encryption process to generate record data, the record data generated by the encryption means, information relating to the first decryption process, the decryption area, Storage means for recording the partitioning information with the non-decoding area.

  According to the above-described invention, it is possible to provide a signal processing apparatus that performs recording control by performing decryption processing adapted to a processing load on broadcast data encrypted on a transmission path.

The block diagram which shows the outline of the signal processing which concerns on 1st Embodiment. FIG. 2 is a block diagram illustrating an outline of a recording process and a reproduction process according to the first embodiment. FIG. 3 is a diagram illustrating a format of a recording data table according to the first embodiment. The figure which shows the content of the recording data table which concerns on 1st Embodiment. The flowchart which shows the process in the signal processing apparatus which concerns on 1st Embodiment. The flowchart shown about the normal process which concerns on 1st Embodiment. 6 is a flowchart illustrating recording processing according to the first embodiment. The flowchart shown about the reproduction | regeneration processing which concerns on 1st Embodiment. The flowchart shown about the reproduction | regeneration processing which concerns on 2nd Embodiment. The block diagram which shows the outline of the signal processing apparatus which concerns on 3rd Embodiment. The flowchart shown about the reproduction | regeneration processing which concerns on 3rd Embodiment.

  Hereinafter, the present embodiment will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an overall configuration of a system including a signal processing apparatus 1 according to the first embodiment. The signal processing device 1 is, for example, a television receiver or a recording / reproducing device. The signal processing device 1 includes a control device 10, a tuner 11, a communication device 12, a display device 13, an audio output device 14, an input device 15, and a storage device 16.

  The control device 10 controls the entire system including the signal processing device 1. An MPU (Micro Processing Unit) 101 controls the operation of each device. A RAM (Random Access Memory) 102 records a program such as a control program. A ROM (Read Only Memory) 103 stores a control program and control data. The power source 104 supplies power to each unit of the control device 10. The input force interface 106 inputs and outputs information to and from each device connected to the control device 10. The oscillator 106 synchronizes with the time setting of the signal processing apparatus 1 and each unit.

  The tuner 11 demodulates the digital broadcast signal received by the antenna. The communication device 12 transmits / receives necessary information via the network 3 such as an optical line. Furthermore, the communication apparatus 12 transmits / receives IP broadcast data via a network. The display device 13 displays various information such as broadcast programs, web information, and control results in the signal processing device 1. The audio output device 14 outputs audio. The input device 15 inputs information instructed by the user. The storage device 16 records broadcast data acquired through the tuner 11 or the communication device 12, for example. Here, the signal processing device 1 is described as a configuration including the display device 13 and the storage device 16, but these may be connected as an external device.

  FIG. 2 is a block diagram schematically illustrating a recording process and a playback process in the signal processing apparatus 1 according to the first embodiment. Broadcast data (first broadcast data) on the transmission path, which is a program distributed from the broadcast station 100 to the signal processing device 1 via the tuner 11 or the communication device 12, is encrypted. Here, the encryption applied to the broadcast data on the transmission path is referred to as a first encryption process. Here, the MPU 101 of the control device 10 includes a processing load measurement module 1011. The processing load measurement module 1011 measures the processing load amount of the MPU 101.

  The MPU 101 records the acquired program in the storage device 16. In this case, when the MPU 101 determines that the processing load amount of the MPU 101 is less than a predetermined value, the MPU 101 decrypts all broadcast data subjected to the first encryption process in one program during the recording process. The MPU 101 records broadcast data (second broadcast data) obtained by performing the first decoding process for all the programs in the storage device 16.

Here, the decryption process performed on the broadcast data by the MPU 101 in correspondence with the first encryption process is referred to as a first decryption process.

  When the MPU 101 determines that the processing load amount of the MPU 101 is equal to or greater than a certain value, the MPU 101 does not perform the first decoding process on the broadcast data of one program during the recording process. The MPU 101 stores, in the storage device 16, broadcast data (second broadcast data) that is a mixture of broadcast data that has been subjected to the first decoding process and broadcast data that has not been subjected to the first decoding process for one program. Record. That is, the MPU 101 changes the amount of broadcast data to be subjected to the first decoding process according to the processing load amount of the MPU 101.

  The MPU 101 completes the first decoding process for the broadcast data of one program (decoding area), and shows segmentation information indicating how far the non-decoding area has not been completed (decoding process incomplete start described later) The address N and the decryption processing incomplete end address N) are reflected in the recording data table 161 and stored in the storage device 16.

  Then, the MPU 101 performs an encryption process different from the first encryption process on the broadcast data and records the broadcast data in the storage device 16. Here, the encryption process that the MPU 101 performs for recording the broadcast data is referred to as a second encryption process. Regardless of whether or not the first decryption process is performed, the broadcast data recorded in the storage device 16 subjected to the second encryption process is referred to as record data.

  When the storage device 16 has recorded the recording data that has been subjected to the first decoding process for all one program, the MPU 101 decodes the recording data and displays it on the display device 13 during the reproduction process. Here, the decryption process performed on the recording data by the MPU 101 in correspondence with the second encryption process is referred to as a second decryption process.

  When the storage device 16 records the recording data in which the first decoding process and the first decoding process are mixed for one program, the MPU 101 stores the recording data in the recording data. The decoding process of 2 is performed, and the area where the first decoding process is not performed is subjected to the first decoding process and displayed on the display device 13. That is, the MPU 101 performs the first decoding process on the recording data based on the recording data table 161 during the reproduction process.

  FIG. 3 is a diagram showing the format of the recording data table 161. The recording data table 161 stores various information in the MPEG (Motion Picture Experts Group) format. The item of program management number indicates an identification number for specifying a program. The sub management number item indicates the TS packet number when the TS (Transport Stream) packet head is 0, in units of TS packets. The offset item indicates an offset byte from the beginning of the TS payload. The size item indicates the data size in bytes.

  The encryption presence / absence item indicates whether or not the second encryption processing is performed on the broadcast data. “1” in this item indicates that there is a second encryption process. “0” in this item indicates that there is no second encryption processing. The item of name indicates an item name for controlling recording data in one program. The value item indicates a specific value of the name item. In the case of encryption, the value corresponding to the encryption presence / absence item is subjected to the second encryption process.

  The items of the transmission path information synchronization information are stored as “0xFFFF” when not used and “0x129A” when used. The item of decoding processing information stores information related to the first decoding processing applied to broadcast data. The item of all decoding process completion information stores “1” when the first decoding process is completed for all the broadcast data of the program management number, and stores “0” otherwise. The item of the decoding process division number stores the division number of the continuous data area in the broadcast data when the first decoding process is not completed for the broadcast data of the program management number.

  The item of the decoding process incomplete start address N is the number of TS packets from the beginning when the first decoding process for the broadcast data of the program management number has not been decoded and the start address of the nth data area Store with. When the value of this item is 0, this item is invalid. The item of the incomplete decoding process end address N stores the start address of the nth data area in the broadcast data of the program management number as the number of TS packets from the head. When the value of this item is 0, this item is invalid.

  The stuffing byte item is filled with a value “0xFF” to satisfy the TS payload length. The items of the decoding process division number, the decoding process incomplete start address N, and the decoding process incomplete completion address N exist only when the item of all decoding process completion information is “0”.

  FIG. 4 is a diagram illustrating a specific example of the recording data table 161. The signal processing device 1 records the acquired broadcast data of the program in the storage device 16 as recording data. In the program management number 0, the item of all decryption processing completion information is “0”. That is, the first decoding process for the broadcast data with program management number 0 has not been completed. The item of the decoding process division number is “3”. That is, the first decoding process is incomplete for three consecutive data areas in the broadcast data of program management number 0.

  Specifically, in the broadcast data, the first decoding process is completed from 1001 packet, which is the value of decoding process incomplete start address 1, to 2000 packet, which is the value of decoding process incomplete end address 1. Not. Of the broadcast data, the first decoding process has not been completed from 4001 packet, which is the value of decoding process incomplete start address 2, to 5000 packet, which is the value of decoding process incomplete completion address 2. Of the broadcast data, the first decoding process is not completed from 6001 packet, which is the value of the decoding process incomplete start address 3, to 7000 packet, which is the value of the decoding process incomplete completion address 3.

  Next, processing in the signal processing device 1 in the first embodiment will be described. FIG. 5 is a flowchart showing processing in the signal processing apparatus 1. The MPU 101 is operated by a control program that is a module for controlling the entire system stored in the ROM 103. When the MPU 101 starts the control program, the MPU 101 initializes each device connected to the control device 10 such as the tuner 11, the communication device 12, the display device 13, the audio output device 14, and the input device 15.

  The MPU 101 acquires the current time and checks whether or not it is a reserved time set in a recording reservation, a viewing reservation, or the like (step S101). When it is the reservation time (step S101, YES), the MPU 101 starts the set reservation process (step S102). If it is not the reserved time (step S101, NO), the MPU 101 waits for, for example, 2 seconds until an instruction from the user is input through the input device 15 (step S103).

  When an instruction by the user is input (step S103, YES), the MPU 101 confirms whether the instruction by the user is an instruction to end the reservation process (step S104). If it is an instruction to end the reservation process (step S104, YES), the MPU 101 ends the reservation process in the system including the signal processing device 1 and turns off the power.

  If it is not an instruction to end the reservation process (step S104, NO), the MPU 101 executes a normal process (step S105). The normal process in the first embodiment includes a program recording process, a program reproducing process recorded in the storage device 16, and a system setting process including the broadcast recording / reproducing apparatus 1 by the user.

  Next, the normal process in step S105 of FIG. 5 will be described. FIG. 6 is a flowchart showing normal processing. First, the MPU 101 determines whether or not the start of recording processing has been input (step S201). When the start of the recording process is input (step S201, YES), the MPU 101 starts the recording process (step S202). When the start of the recording process is not input (step S201, NO), the MPU 101 determines whether the start of the reproduction process is input (step S203). When the start of the reproduction process is input (step S203, YES), the MPU 101 starts the reproduction process of the program recorded in the storage device 16 (step S204). When the start of the reproduction process is not input (step S203, NO), the MPU 101 starts the setting process in the system including the broadcast recording / reproducing apparatus 1 input by the user (step S205).

  Next, the recording process in step S202 in FIG. 6 will be described. FIG. 7 is a flowchart showing the recording process. Here, a specific example of the recording data table 161 shown in FIG. 4 will be described.

  The MPU 101 selects the broadcast signal of the channel selected when the user sets the recording reservation by the tuner 11 (step S301). The tuner 11 functions as an acquisition unit. The MPU 101 starts a program reception process in the tuner 11. The MPU 101 refers to the item of transmission path information synchronization information in the recording data table 161 from the top, and sets the program management number “0” corresponding to 0xFFFF (empty) as the program management number of the broadcast data to be recorded. .

  The MPU 101 first stores “0” in the sub management number of the program management number “0”. The MPU 101 stores information on the first decoding process used for the broadcast data to be recorded in the item of the decoding process information. The MPU 101 initially stores “1” in the item of all decoding processing completion information.

  The MPU 101 reads out broadcast data in one program, for example, in units of 1000 packets, and performs recording processing. The MPU 101 confirms whether there is broadcast data to be read (step S302). When there is no broadcast data to be read (step S302, NO), the MPU 101 ends the recording process.

  When there is broadcast data to be read (initially from 1 packet to 1000 packets) (step S302, YES), the MPU 101 measures the usage rate of the MPU 101 in the system including the signal processing device 1 by the processing load measurement module 1011. The processing load measurement module 1011 functions as a measurement unit. The MPU 101 determines whether the usage rate of the MPU 101 is equal to or greater than a certain value (step S303). The MPU 101 functions as a determination unit. Here, the usage rate of the MPU 101 is 40%, but this value is variable. When the usage rate of the MPU 101 is, for example, 20% and is not equal to or greater than a certain value (NO in step S303), the MPU 101 performs the first decryption process on the broadcast data for 1000 packets subjected to the first encryption process. (Step S304). The MPU 101 functions as a decoding unit.

  Next, the MPU 101 performs a second encryption process on the broadcast data from 1 packet to 1000 packets subjected to the first decryption process (step S305). The MPU 101 functions as an encryption unit. The MPU 101 updates the recording data table 161 (step S306), and stores the broadcast data obtained by performing the second encryption processing on the items of the sub management numbers 1 to 1000 of the recording data table 161 as the recording data (step S307). . The recording data table 161 functions as a storage unit. The MPU 101 returns to step S302 and reads broadcast data from 1001 packets to 2000 packets.

  When the usage rate of the MPU 101 at the time of recording processing of broadcast data from 1001 packets to 2000 packets is, for example, 50% and above a certain value (step S303, YES), the MPU 101 includes “ “0” is stored. The recorded data table 161 indicates that the first decoding process for the broadcast data with program management number 0 has not been completed. Further, the MPU 101 stores “1” in the item of the decoding process division number. Further, the MPU 101 stores 1001 which is the number of offset packets of the TS packet currently read out in the item of the decoding process incomplete start address 1.

  Next, the MPU 101 performs second encryption on broadcast data from 1001 packets to 2000 packets that have not been subjected to the first decryption process (step S305). The MPU 101 updates the recording data table 161 (step S306), and stores the broadcast data obtained by performing the second encryption processing on the items of the sub management numbers 1001 to 2000 of the recording data table 161 as recording data (step S307). . The MPU 101 returns to step S302 and reads broadcast data from 2001 packets to 3000 packets.

  When the usage rate of the MPU 101 at the time of recording the broadcast data from 2001 packets to 3000 packets is not a certain value or more (step S303, NO), the MPU 101 performs the first decoding process on the broadcast data from 2001 packets to 3000 packets. (Step S304).

  The MPU 101 stores 2000, which is the number of offset packets of the TS packet currently read out, in the item of the decryption processing incomplete end address 1 of the program management number 0. Next, the MPU 101 performs a second encryption process on the broadcast data from the 2001 packet to the 3000 packet subjected to the first decryption process (step S305). The MPU 101 updates the recording data table 161 (step S306), and stores the broadcast data obtained by performing the second encryption processing on the items of the sub management numbers 2001 to 3000 of the recording data table 161 as recording data (step S307). . The MPU 101 returns to step S302 and reads broadcast data from 3001 packets to 4000 packets.

  When the usage rate of the MPU 101 during the recording processing of broadcast data from 3001 packets to 4000 packets is not a certain value or more (step S303, NO), the MPU 101 performs the first decoding processing on the broadcast data from 3001 packets to 4000 packets. (Step S304).

  The MPU 101 performs the second encryption process on the broadcast data from the 3001 packet to the 4000 packet subjected to the first decryption process (step S305). Since the MPU 101 has performed the first decoding process similarly to the broadcast data from 2001 packets to 3000 packets, the MPU 101 does not update the recording data table 161 (step S306). The MPU 101 stores broadcast data obtained by performing the second encryption processing on the items of the sub management numbers 3001 to 4000 of the recording data table 161 as recording data (step S307). The MPU 101 returns to step S302 and reads broadcast data from 4001 packets to 5000 packets.

  When the usage rate of the MPU 101 at the time of recording processing of broadcast data from 4001 packets to 5000 packets is a certain value or more (step S303, YES), the MPU 101 adds “1” to the item of the number of divisions for decoding processing. Is stored. The MPU 101 stores 4001 which is the number of offset packets of the currently read TS packet in the item of the decoding process incomplete start address 2.

  Next, the MPU 101 performs a second encryption process on broadcast data from 4001 packets to 5000 packets that have not been subjected to the first decryption process (step S305). The MPU 101 updates the recording data table 161 (step S306), and stores the broadcast data obtained by performing the second decoding process on the items of the sub management numbers 4001 to 5000 of the recording data table 161 as recording data (step S307). . The MPU 101 returns to step S302 and reads broadcast data from 5001 packets to 6000 packets.

  If the usage rate of the MPU 101 at the time of recording the broadcast data from 5001 packets to 6000 packets is not a certain value or more (step S303, NO), the MPU 101 performs the first decoding process on the broadcast data from 5001 packets to 6000 packets. (Step S304).

  The MPU 101 stores 5000, which is the number of offset packets of the currently read TS packet, in the item of the program management number 0 in the decoding process incomplete completion address 2. Next, the MPU 101 performs second encryption processing on broadcast data from 5001 packets to 6000 packets subjected to the first decryption processing (step S305). The MPU 101 updates the recording data table 161 (step S306), and stores the broadcast data obtained by performing the second encryption processing on the items of the sub management numbers 5001 to 6000 of the recording data table 161 as recording data (step S307). . The MPU 101 returns to step S302 and reads broadcast data from 6001 packets to 7000 packets.

  When the usage rate of the MPU 101 at the time of the recording processing of the broadcast data from 6001 packets to 7000 packets is a certain value or more (step S303, YES), the MPU 101 adds 1 to the item of the decoding process division number to “3”. Is stored. The MPU 101 stores 6001 which is the number of offset packets of the TS packet currently read out in the item of the decoding process incomplete start address 3.

  Next, the MPU 101 performs a second encryption process on broadcast data from 6001 packets to 7000 packets that have not been subjected to the first decryption process (step S305). The MPU 101 updates the recording data table 161 (step S306), and stores the broadcast data obtained by performing the second decoding process on the items of the sub management numbers 6001 to 7000 of the recording data table 161 as recording data (step S307). . The MPU 101 returns to step S302 and reads broadcast data from 7001 packets to 8000 packets.

  When the usage rate of the MPU 101 at the time of recording the broadcast data from 7001 packets to 8000 packets is not a certain value or more (step S303, NO), the MPU 101 performs the first decoding process on the broadcast data from 7001 packets to 8000 packets. (Step S304).

  The MPU 101 stores 7000, which is the number of offset packets of the TS packet currently read out, in the item of the decryption processing incomplete end address 3 of the program management number 0. Next, the MPU 101 performs second encryption processing on the broadcast data from 7001 packets to 8000 packets subjected to the first decryption processing (step S305). The MPU 101 updates the recording data table 161 (step S306), and stores the broadcast data obtained by performing the second encryption processing on the items of the sub management numbers 7001 to 8000 of the recording data table 161 as recording data (step S307). . The MPU 101 returns to step S302 and reads broadcast data from 8001 packets to 9000 packets. Here, if there is no broadcast data to be read (step S302, NO), the MPU 101 ends the recording process.

  Next, the reproduction process in step S204 of FIG. 6 will be described. FIG. 8 is a flowchart showing the reproduction process. Here, a specific example of the recording data table 161 shown in FIG. 4 will be described.

  The MPU 101 selects, from the recording data table 161, recording data to be subjected to reproduction processing selected by the user (step S401). Here, the MPU 101 selects the record data of the program management number 0.

  The MPU 101 refers to the item of all decoding processing completion information in the sub management number 0 of the program management number 0. The MPU 101 determines that the first decoding process has not been completed for the record data of the program management number 0 because the item of all decoding process completion information is “0”. Further, the MPU 101 refers to the item of the decryption process rate. Here, the MPU 101 confirms that the item of the decryption processing rate is “3”. The MPU 101 refers to the item of the decryption processing incomplete start address 1 and confirms that the value is “1001”.

  Next, the MPU 101 checks whether or not recording data is stored in the sub management numbers 1 to 1000 of the program management number 0 of the recording data table 161 (step S402). When the recording data is not stored (step S402, NO), the MPU 101 ends the reproduction process.

  When the recording data is stored (step S402, YES), the MPU 101 reads out the recording data of the sub management numbers 1 to 1000 and performs the second decoding process (step S403). The MPU 101 functions as a decoding unit. The MPU 101 refers to the decryption process incomplete start address 1 and the decryption process incomplete end address 1, and the first decryption process is performed on the recording data of the sub management numbers 1 to 1000 subjected to the second decryption process. It is determined whether or not it is completed (step S404).

  Here, since the item of the decryption processing incomplete start address 1 is “1001”, the MPU 101 determines that the first decryption processing has been completed for the recording data of the sub management numbers 1 to 1000 (step S1). S404, NO). The MPU 101 functions as a determination unit. Therefore, the MPU 101 reproduces the recording data of the sub management numbers 1 to 1000 that has been subjected to the second decoding process, and displays it on the display device 13 (step S406). The MPU 101 functions as a playback unit.

  Next, the MPU 101 checks whether or not recording data is stored in the sub management numbers 1001 to 2000 of the program management number 0 of the recording data table 161 (step S402). When the recording data is stored (step S402, YES), the MPU 101 reads the recording data of the sub management numbers 1001 to 2000 and performs the second decoding process (step S403). Since the MPU 101 has the decryption process incomplete start address 1 item “1001” and the decryption process incomplete end address 1 item “2000”, the MPU 101 performs the first decryption on the recording data of the sub management numbers 1001 to 2000. It is determined that the conversion process has not been completed (step S404, YES). The MPU 101 refers to the item of the decryption process information on the recording data of the sub management numbers 1001 to 2000 subjected to the second decryption process and performs the first decryption process (step S405). Next, the MPU 101 reproduces the recorded data of the sub management numbers 1001 to 2000 and displays it on the display device 13 (step S406).

  Next, the MPU 101 checks whether or not recording data is stored in the sub management numbers 2001 to 3000 of the program management number 0 of the recording data table 161 (step S402). When the recording data is stored (step S402, YES), the MPU 101 reads the 3000 recording data from the sub management number 2001 and performs the second decoding process (step S403). The MPU 101 determines that the first decryption process has been completed for the recording data of the sub management numbers 2001 to 3000 because the item of the decryption process incomplete start address 2 is “4001” (step S404, NO) ). Therefore, the MPU 101 reproduces the recording data of the sub management numbers 2001 to 3000 that have been subjected to the second decryption process, and displays them on the display device 13 (step S406).

  Next, the MPU 101 checks whether recording data is stored in the sub management numbers 3001 to 4000 of the program management number 0 of the recording data table 161 (step S402). When the recording data is stored (step S402, YES), the MPU 101 reads the 4000 recording data from the sub management number 3001 and performs the second decoding process (step S403). The MPU 101 determines that the first decryption process has been completed for the recording data of the sub management numbers 3001 to 4000 because the item of the decryption process incomplete start address 2 is “4001” (step S404, NO) ). Therefore, the MPU 101 reproduces the recorded data of the sub management numbers 3001 to 4000 subjected to the second decoding process and displays it on the display device 13 (step S406).

  Next, the MPU 101 checks whether or not recording data is stored in the sub management numbers 4001 to 5000 of the program management number 0 of the recording data table 161 (step S402). When the recording data is stored (step S402, YES), the MPU 101 reads the recording data of the sub management numbers 4001 to 5000 and performs the second decoding process (step S403). Since the MPU 101 has the decryption process incomplete start address 2 item “4001” and the decryption process incomplete end address 2 item “5000”, the MPU 101 performs the first decryption on the recording data of the sub management numbers 4001 to 5000. It is determined that the conversion process has not been completed (step S404, YES). The MPU 101 performs the first decoding process with reference to the item of the decoding process information with respect to the recording data of the sub management numbers 4001 to 5000 subjected to the second decoding process (step S405). Next, the MPU 101 reproduces the recorded data of the sub management numbers 4001 to 5000 and displays it on the display device 13 (step S406).

  Next, the MPU 101 checks whether or not the recording data of the sub management numbers 5001 to 6000 of the program management number 0 of the recording data table 161 is stored (step S402). When the recording data is stored (step S402, YES), the MPU 101 reads the recording data of the sub management numbers 5001 to 6000 and performs the second decoding process (step S403). The MPU 101 determines that the first decryption process has been completed for the recording data of the sub management numbers 5001 to 6000 because the item of the decryption process incomplete start address 3 is “6001” (step S404, NO) ). Therefore, the MPU 101 reproduces the recording data of the sub management numbers 5001 to 6000 that have been subjected to the second decoding process, and displays them on the display device 13 (step S406).

  Next, the MPU 101 checks whether or not recording data is stored in the sub management numbers 6001 to 7000 of the program management number 0 of the recording data table 161 (step S402). When the recording data is stored (step S402, YES), the MPU 101 reads the recording data of the sub management numbers 6001 to 7000 and performs the second decoding process (step S403). Since the item of the incomplete decoding start address 3 is “6001” and the item of the incomplete decoding end address 3 is “7000”, the MPU 101 performs the first decoding on the recording data of the sub management numbers 6001 to 7000. It is determined that the conversion process has not been completed (step S404, YES). The MPU 101 performs the first decoding process with reference to the item of the decoding process information with respect to the recording data of the sub management numbers 6001 to 7000 that has been subjected to the second decoding process (step S405). Next, the MPU 101 reproduces the recording data of the sub management numbers 6001 to 7000 and displays it on the display device 13 (step S406). Here, if there is no recording data of the sub management numbers 7001 to 8000 of the program management number 0 of the recording data table 161 (step S402, NO), the MPU 101 ends the reproduction process.

  According to the first embodiment, when the control device 10 receives one or more broadcast data at the same time during the recording process, the control device 10 applies the first decoding process to the broadcast data in accordance with the processing load of the control device 10, and broadcasts. An area of the data that has not been subjected to the first decoding process is recorded in the recording data table. Therefore, since the control device 10 can reduce the processing load during the recording process, the failure of the reception process or the recording process can be avoided.

  Furthermore, according to the first embodiment, since the decoding process information is stored in the recording data table, the control device 10 refers to the recording data table during the reproduction process, and performs the first decoding of the recording data. Since the first decryption process is performed only on the unprocessed area, the recorded data can be reproduced normally.

  Next, a second embodiment will be described. The second embodiment is different from the first embodiment in reproduction processing. Since other processes are the same as those in the first embodiment, description thereof will be omitted. FIG. 9 is a flowchart showing the reproduction processing according to the second embodiment. Steps S501, S502, S503, S504, S505, and S507 in FIG. 9 are the same as steps S401, S402, S403, S404, S405, and S406 in FIG. To do.

  A case will be described in which the MPU 101 reads recorded data of 2000 from the sub management number 1001 to the program management number 0 of the recording data table 161 (step S502, YES). The MPU 101 performs the second decoding process on the recording data of the sub management numbers 1001 to 2000 (step S503). Since the MPU 101 has the decryption process incomplete start address 1 item “1001” and the decryption process incomplete end address 1 item “2000”, the MPU 101 performs the first decryption on the recording data of the sub management numbers 1001 to 2000. It is determined that the conversion process has not been completed (step S504, YES).

  The MPU 101 performs the first decoding process with reference to the item of the decoding process information on the recording data of the sub management numbers 1001 to 2000 subjected to the second decoding process (step S505). The MPU 101 performs the second encryption process on the record data subjected to the first decryption process, and stores the record data in the items of the sub management numbers 1001 to 2000. The MPU 101 stores “0” in the items of the decryption process incomplete start address 1 and the decryption process incomplete end address 1 of the recording data table 161. Further, the MPU 101 stores “2” obtained by subtracting 1 from “3” in the item of the number of divisions for decoding processing (step S506). Next, the MPU 101 reproduces the recorded data of the sub management numbers 1001 to 2000 and displays it on the display device 13 (step S507).

  A case will be described in which the MPU 101 reads out the recording data of the sub management numbers 4001 to 5000 of the program management number 0 of the recording data table 161 (step S502, YES). The MPU 101 performs the second decoding process on the recording data of the sub management numbers 4001 to 5000 (step S503). Since the MPU 101 has the decryption process incomplete start address 2 item “4001” and the decryption process incomplete end address 2 item “5000”, the MPU 101 performs the first decryption on the recording data of the sub management numbers 4001 to 5000. It is determined that the conversion process has not been completed (step S504, YES).

  The MPU 101 performs the first decoding process with reference to the item of the decoding process information with respect to the recording data of the sub management numbers 4001 to 5000 subjected to the second decoding process (step S505). The MPU 101 performs the second encryption process on the record data subjected to the first decryption process, and stores the record data in the items of the sub management numbers 4001 to 5000. The MPU 101 stores “0” in the items of the decryption process incomplete start address 2 and the decryption process incomplete end address 2 in the recording data table 161. Further, the MPU 101 stores “1” obtained by subtracting 1 from “2” in the item of the decoding process division number (step S506). Next, the MPU 101 reproduces the recording data of the sub management numbers 4001 to 5000 and displays it on the display device 13 (step S507).

  A case will be described in which the MPU 101 reads out the recording data of the sub management numbers 6001 to 7000 of the program management number 0 of the recording data table 161 (step S502, YES). The MPU 101 performs the second decoding process on the recording data of the sub management numbers 4001 to 5000 (step S503). Since the item of the incomplete decoding start address 3 is “6001” and the item of the incomplete decoding end address 3 is “7000”, the MPU 101 performs the first decoding on the recording data of the sub management numbers 6001 to 7000. It is determined that the conversion process has not been completed (step S504, YES).

  The MPU 101 performs the first decoding process with reference to the item of the decoding process information with respect to the recording data of the sub management numbers 6001 to 7000 subjected to the second decoding process (step S505). The MPU 101 performs the second encryption process on the record data subjected to the first decryption process, and stores the record data in the items of the sub management numbers 6001 to 7000. The MPU 101 stores “0” in the items of the decryption process incomplete start address 3 and the decryption process incomplete end address 3 in the recording data table 161. Further, the MPU 101 stores “0” obtained by subtracting 1 from “1” in the item of the number of divisions for decoding processing. Further, the MPU 101 stores “1” in the item of all decoding processing completion information (step S506). Next, the MPU 101 reproduces the recording data of the sub management numbers 6001 to 7000 and displays it on the display device 13 (step S507).

  According to the second embodiment, when reproducing the recorded data that has not been subjected to the first decoding process, the control device 10 stores the recorded data in the recorded data table 161 after performing the first decoding process. Re-record. Therefore, when the re-recorded recording data is reproduced next time, the control device 10 does not need the first decoding process, and thus can reduce the processing load during the reproduction process. Therefore, the control device 10 can avoid the failure even when the reception process or the recording process is executed simultaneously with the reproduction process.

  Next, a third embodiment will be described. FIG. 10 is a block diagram showing the overall configuration of a system including the signal processing apparatus 1 according to the second embodiment. About the same part as the structure demonstrated in 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. The signal processing device 1 has a configuration in which the storage device 43 is excluded from the first embodiment shown in FIG.

  The signal processing device 4 includes a control device 40, a tuner 41, a communication device 42, and a storage device 43. The storage device 43 has a recording data table 431. The control device 40 includes an MPU 401, a RAM 402, a ROM 403, a power supply 404, an input / output interface 405, and an oscillator 406. The control device 40, tuner 41, communication device 42, storage device 43, and recording data table 431 are the same as the control device 10, tuner 11, communication device 12, storage device 16, and recording data table 161 described in the first embodiment. It is the same composition. The MPU 401, RAM 402, ROM 403, power supply 404, input / output interface 405, and oscillator 406 have the same configuration as the MPU 101, RAM 102, ROM 103, power supply 104, input / output interface 105, and oscillator 106 described in the first embodiment. . Here, the signal processing device 4 is described as a configuration including the storage device 43, but these may be connected as an external device.

  The communication device 12 of the signal processing device 1 is connected to the communication device 42 of the signal processing device 4 via the network 3. The control device 10 of the signal processing device 1 controls the entire system including the signal processing device 4. The control device 40 of the signal processing device 4 performs sub-control according to control by the control device 10 of the signal processing device 1. That is, the control device 10 is a main control device of a system including the signal processing device 1, and the control device 40 is a sub-control device.

  The MPU 101 of the control device 10 operates by a main control program that is a module for controlling the entire system stored in the ROM 103. The MPU 401 of the control device 40 operates according to a sub control program stored in the ROM 403 in cooperation with the main control program. When starting the main control program, the MPU 101 initializes each device connected to the control device 10 such as the tuner 11, the communication device 12, the display device 13, the audio output device 14, and the input device 15. When the MPU 401 starts the sub-control program, the MPU 401 initializes each device connected to the control device 40 such as the tuner 41, the communication device 42, and the storage device 43.

  The third embodiment is different from the first embodiment in the recording process. Since other processes are the same as those in the first embodiment, description thereof will be omitted. FIG. 11 is a flowchart showing the reproduction processing according to the third embodiment. Step S601, step S602, step S603, step S604, step S605, and step S606 in FIG. 11 are the same as step S301, step S302, step S303, step S304, step S305, and step S307 in FIG. To do.

  In the third embodiment, the MPU 401 of the control device 40 mainly executes recording processing according to the sub control program. The case where the MPU 401 reads broadcast data from 1 packet to 1000 packets (step S602, YES) will be described. When the MPU 401 determines that the usage rate of the MPU 401 is not equal to or greater than a certain value (40%) (NO in step S603), the MPU 401 performs a first decoding process on the broadcast data for 1000 packets (step S604). Next, the MPU 401 performs a second encryption process on the broadcast data from 1 packet to 1000 packets subjected to the first decryption process (step S605). The MPU 401 stores broadcast data obtained by performing the second encryption processing on the items of the sub management numbers 1 to 1000 of the recording data table 431 as recording data (step S606). The MPU 101 returns to step S602 and reads broadcast data from 1001 packets to 2000 packets.

  Next, a case where the MPU 401 reads broadcast data from 1001 packets to 2000 packets (step S602, YES) will be described. When the MPU 401 determines that the usage rate of the MPU 401 is 50% and is equal to or greater than a certain value (40%) (YES in step S603), the MPU 401 transmits the 1001 packet to the control device 10 via the communication device 42 and the communication device 12. Broadcast data up to 2000 packets and information instructing execution of the first decoding process on the broadcast data are transferred. The communication device 42 functions as a transmission unit. The MPU 101 of the control device 10 performs a first decoding process on broadcast data from 1001 packets to 2000 packets. The MPU 101 functions as a decoding unit. Then, the MPU 101 transfers the broadcast data from 1 packet to 1000 packets subjected to the first decoding process to the control device 40 via the communication device 12 and the communication device 42 (step S607). The communication device 12 functions as a transmission unit.

  Next, the MPU 401 performs second encryption processing on broadcast data from 1 packet to 1000 packets subjected to the first decryption processing (step S605). The MPU 401 stores broadcast data obtained by performing the second encryption processing on the items of the sub management numbers 1001 to 2000 in the recording data table 431 as recording data (step S606). The MPU 401 returns to Step S602 and repeats the recording process thereafter.

  In step S607 of FIG. 11, the MPU 101 transfers the broadcast data subjected to the first decryption process to the control device 40, but further adds a second encryption to the broadcast data subjected to the first decryption process. Processing may be performed and transferred to the control device 40.

  According to the third embodiment, when the control device 40 receives one or more pieces of broadcast data at the same time during the recording process, the control device 10 performs the first decoding on the broadcast data in accordance with the processing load of the control device 40. Control is performed to perform processing. Therefore, the area | region where the 1st decoding data is not given among broadcast data reduces. Further, since the control device 40 can reduce the processing load during the recording process, it is possible to avoid the failure of the reception process or the recording process.

  In the present embodiment, the signal processing device 1 (4) performs the first decoding process in accordance with the processing load of the MPU 101 (401). However, the load on the storage device 16 (46), the amount of memory used, etc. The first decoding process may be performed adaptively.

  In the present embodiment, the signal processing device 1 (4) performs the first decoding process in accordance with the processing load of the MPU 101 (401), but the first processing is performed regardless of the processing load of the signal processing device 1 (4). The decryption process 1 may not be performed, and all the decryption process completion information may be stored in the recording data table 161 (431).

  In the present embodiment, the signal processing apparatus 1 (4) performs the first decoding process in accordance with the MPU 101 (401) processing load during the recording process and the reproduction process, but at the time of recording data transfer (MOVE / UPLOAD / COPY etc.) may be subjected to the first decoding process.

  In the present embodiment, the format of the recording data table 161 is defined, but the format is not limited to this. The distinction of the encryption / non-encryption of each item is not limited to this.

  In the present embodiment, the signal processing apparatus 1 (4) performs the second encryption process on the recorded data during the recording process and performs the second decryption process during the reproduction process regardless of the processing load of the MPU 101 (401). However, neither the second encryption process during the recording process nor the second decryption process during the reproduction process need be performed on the recording data.

  In the present embodiment, the signal processing apparatus 1 (4) performs the first decoding process on the broadcast data during the recording process or the reproduction process. However, when the processing load of the MPU 101 (401) is low, the recorded data table 161 (431), the first decoding process may be performed on the recording data that has not been subjected to the first decoding process, and re-recording may be performed.

  In this embodiment, the tuner 11 (41) is used. However, broadcast data may be received without using a tuner for IPTV.

  In the third embodiment, when the processing load of the MPU 401 is high, one signal processing device 4 performs local encryption processing on the broadcast data, and the other signal processing device 1 performs second encryption processing on the broadcast data. The processing load on the MPU 401 may be reduced.

  In the third embodiment, the control device 10 and the control device 20 are connected via the communication device 12 and the communication device 42. However, the connection method is not limited to this, and the control device 10 and the control device 20 are connected via the local bus. Also good.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by variously modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements according to different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 1 ... Signal processing apparatus, 4 ... Signal processing apparatus, 10 ... Control apparatus, 11 ... Tuner, 12 ... Communication apparatus, 16 ... Storage apparatus, 40 ... Control apparatus, 42 ... Communication apparatus, 43 ... Storage apparatus, 101 ... MPU, 161: recording data table, 401: MPU, 431: recording data table.

Claims (10)

Obtaining means for obtaining the first broadcast data encrypted by the first encryption processing;
Control means for selectively controlling whether or not the first broadcast data is decoded and stored in the first decoding process during the recording process;
First decoding means for decoding the first broadcast data in the first decoding process to generate second broadcast data;
When the first decoding means generates the second broadcast data, the second broadcast data is stored, and when the first decoding means does not generate the second broadcast data, Storage means for storing information relating to one broadcast data and the first decoding process;
A signal processing apparatus. Encryption means for encrypting the first broadcast data or the second broadcast data by a second encryption process;
The signal processing apparatus according to claim 1, wherein the storage unit stores the first broadcast data or the second broadcast data encrypted by the second encryption process.   And a second decryption unit configured to decrypt the first broadcast data or the second broadcast data encrypted by the second encryption process by a second decryption process during the reproduction process. 2. Signal processing apparatus.   4. The signal processing apparatus according to claim 3, wherein during the reproduction process, the first decoding unit decodes the first broadcast data stored in the storage unit by the first decoding process. At the time of the reproduction process, the encryption means encrypts the first broadcast data decrypted by the first decryption process by the second encryption process,
The signal processing apparatus according to claim 4, wherein the storage unit stores the first broadcast data encrypted by the second encryption process.   The signal processing apparatus according to claim 1, wherein the acquisition unit acquires the first broadcast data via a network.   The signal processing apparatus according to claim 1, further comprising a measurement unit that measures a processing load during the recording process.   The signal processing apparatus according to claim 7, wherein the control unit controls whether or not the first broadcast data is decoded by the first decoding process based on the processing load. Obtaining means for obtaining broadcast data encrypted by the first encryption processing;
First decoding means for decoding the broadcast data by a decoding process;
Second decoding means for decoding the broadcast data by the decoding process;
Control means for selectively controlling whether the broadcast data is to be decoded by the first decoding means or the second decoding means during the recording process;
Storage means for storing the broadcast data decoded by the first decoding means or the second decoding means;
A signal processing apparatus. Obtaining the first broadcast data encrypted by the first encryption process;
Selectively controlling whether or not the first broadcast data is decoded and recorded by the first decoding process during the recording process;
Decoding the first broadcast data by a first decoding process to generate second broadcast data;
When the second broadcast data is generated, the second broadcast data is recorded and controlled. When the second broadcast data is not generated, the first broadcast data and the information related to the first decoding process are stored. Record control,
Signal processing method.

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